CVE-2026-109291

High

Description

Open WebUI from 0.6.33 before 0.11.4 contains a cross-site scripting vulnerability that allows authenticated users to execute script in victims' sessions by storing javascript: URLs in citation embed_url fields. Attackers can share a crafted chat whose citation, when clicked, is passed to window.open, letting them steal localStorage.token and act as the victim.

SeverityHigh

CVSS7.3

Exploit probability—

ProductOpen-webui

PublishedOct 12, 2026

First seenOct 12, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

open-webui open-webui0.11.4 or later

Vendor advisories

github.com/open-webui/open-webui/security/advisories/GHSA-qpqv-xwg8-cqpj

Affected products

Product	Affected versions	Fixed in
open-webui open-webui	0.6.33 ≤ v < 0.11.4	0.11.4

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